Why is it called the periodic table? Have you wondered? I asked a bunch of 9-year-olds who had been introduced to the periodic table recently. Hands went up enthusiastically in the air.
D: Ma'm I think it is because of the time period
S: Yes, like when they were found
Me: You mean like the timeline?
D: Yes, yes, like that
Me: That is an interesting hypothesis of why it is called the 'periodic table'. Anyone else?
I: I think it is because the elements are arranged in the order of their weight
Me: That is partly right. However, they could have called it the 'weight table' or the 'element line' like the number line right? Why is it called 'periodic'?
Since classes are online one of them, P (googles the answer and starts reading it out)
Me: P, I know there is an explanation of what is a periodic table is on Google. If you can read and tell me why that makes it periodic I'd like to hear that (she nods). Okay, anyone else?
S: Maybe, they are arranged by their use?
Me: Then it could be called the 'use table' or 'benefits table' why is it called 'periodic'?
(they are all silent and thinking)
Me: Think of the word periodic in the context of a swing or pendulum. What happens?
S: It goes back and forth
D: Again and again
Me: Yes. Ishaan was partly right, the elements were arranged in the order of weight but they realized that after every eight elements the properties seem to repeat and the group of elements seem to be more like each other than other sets. This seemed to be a periodic pattern across and hence, it is called Periodic Table. This way learning about each group gives you a lot of information about the similarities and differences between the same and other groups.
The 'why' of 'what' children are learning is important to them. Not just for a deep understanding of the topic but also to figure out ways to master the content. They learn to establish connections to remember the reason behind what they are learning as well as, in this context, how scientists thought about problems that were beyond them and what led to the discovery of knowledge that we hold so fundamental in today's understanding of science.
Contributed by Sreeja Iyer, CEO of Sparkling Mindz Global Preschool, School, and Afterschool.
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